A rotation indicator device, for mounting on a nut or a bolt head which has a periphery of polygonal shape and which is rotatable relative to a fixed position member, to indicate rotation of the nut or bolt head relative to the fixed position member comprises a flexible strip 10 attached to a laterally projecting indicator or pointer 12. A first ratchet-toothed section 22 is provided which serves as a tongue. A second ratchet-toothed section 32 is provided in a channel 35. The channel 35 has an open side so that the tongue is insertable through the channel 35 to form the flexible strip 10 to the size of the nut or bolt head by engagement of the opposed ratchet- toothed sections, but the tongue is releasable from the channel 35 by lifting in an upward direction from a common plane of the flexible strip 10 and out of the open side of the channel 25.
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